Not to be a jerk, but is English your first language? If not, it seems like they are maybe trying to dismiss you because of this. I'm not sure what the best solution to this would be if that is in fact the case. Maybe if you have someone more comfortable with the language that you trust, they could go with you?

Who give a f$%# about his comfort with the language. The only thing they should care about is when he brings the car in for repair.